Ernest MacKay (7 October 1896 – November 1995) was an Irish footballer who played in an international tournament representing Ireland in 1924.
When the 1916 Easter Uprising broke out, MacKay remained in Ireland where he was employed as a telegram boy for the General Post Office in Dublin.
He began playing football and joined the St James's Gate FC, where he was part of the team that won the League of Ireland in 1921 and 1922.
MacKay was also a member of the Irish Free State football team that competed in the 1924 Summer Olympics in Paris, France.
MacKay left Ireland with his wife Bea to live in Colchester near to their daughter Elizabeth in the 1960s after he had retired as a superintendent with the General Post Office.